Here are a few options for a formal title, depending on your preferred emphasis:
Option 1 (Most direct):
“Prime Minister Keir Starmer Warns of Foreign State-Sponsored Sabotage and Disinformation”
Option 2 (Focusing on the threat):
“Keir Starmer Condemns Foreign Efforts to Destabilize the Nation Through Coordinated Aggression”
Option 3 (Concise and journalistic):
“Starmer Warns of Escalating Foreign State Interference, Sabotage, and Disinformation”
Note: Since the original title included “Latest news from Azerbaijan,” you may wish to append that at the end if it is a site-specific tag, e.g., “Starmer Warns of Escalating Foreign State Interference and Sabotage – Latest News from Azerbaijan“